package com.company;

public class This {
    public static void main(String[] args){
    demo D=new demo();
    D.test();
    }
}
class demo{
    int a=20;
    String s;
    public void test(){
        int a= 10;
        System.out.println(a);
        System.out.println(s);
        System.out.println(this.a);
    }
}